Randy Dunlap wrote: > Miller, Mike (OS Dev) wrote: >>> -----Original Message----- >>> From: Randy Dunlap [mailto:randy.dunlap@xxxxxxxxxx] >>> Sent: Thursday, September 25, 2008 3:40 PM >>> To: scsi >>> Cc: Jens Axboe; Miller, Mike (OS Dev); James Bottomley; lkml; akpm >>> Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr >>> >>> On Thu, 25 Sep 2008 13:33:07 -0700 Randy Dunlap wrote: >>> >>>> Jens Axboe wrote: >>>>> On Thu, Sep 04 2008, Miller, Mike (OS Dev) wrote: >>>>>>>>>> 0x3bb2 <do_cciss_intr+1649>: mov 0x2(%r8),%dx >>>>>>>>>> 0x3bb7 <do_cciss_intr+1654>: test %dx,%dx >>>>>>>>>> 0x3bba <do_cciss_intr+1657>: je 0x3f0e >>> <do_cciss_intr+2509> >>>>>>>>>> $ addr2line -e cciss.o -f do_cciss_intr+0x627 SA5_fifo_full >>>>>>>>>> >>> /home/rdunlap/linsrc/linux-2.6.27-rc3-git7/drivers/block/cciss.h:2 >>>>>>> 06 >>>>>>>>> OK ...that's confusing. It seems to be saying that >>> ctrlr_info_t >>>>>>>>> * was NULL. However, I can't see a way of getting into the >>>>>>> fifo_full >>>>>>>>> callback from do_cciss_intr .. >>>>>>>>> especially not with an NULL host. >>>>>>>>> >>>>>>>>> James >>>>>>>> That is weird. Even if we could get there fifo_full doesn't >>>>>>> do anything but wait for a bit. >>>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> This just happened again. This time it's on 2.6.27-rc5-git3. >>>>>>> >>>>>>> ~Randy >>>>>> Thanks Randy. I think. :) >>>>>> >>>>>> I'll try to recreate in my lab. >>>>> This looks somewhat strange, mostly like 'c' is NULL and it's >>>>> oopsing in in removeQ (I don't think Randy's analysis is >>> correct in >>>>> assuming it's 'h' and it's in fifo_full). Given that 'c' >>> cannot be >>>>> NULL, it's c->prev or c->next that are NULL. > > This BUG: has happened (now) 5 times today. Higher frequency than usual for > some reason. > > I enabled CCISS_DEBUG and added one printk in removeQ(). On the first call s/first/second/ > to removeQ(), both c->next and c->prev are NULL. > > Here's the kernel log output from cciss: > > cciss 0000:42:08.0: PCI INT A -> Link[LNKA] -> GSI 54 (level, high) -> IRQ 54 > command = 147 > irq = 36 > board_id = 3211103c > cciss 0000:42:08.0: irq 87 for MSI/MSI-X > address 0 = fdf80000 > cfg base address = 10 > cfg base address index = 0 > cfg offset = 400 > Controller Configuration information > ------------------------------------ > Signature = CISS > Spec Number = 1 > Transport methods supported = 0x6 > Transport methods active = 0x3 > Requested transport Method = 0x0 > Coalesce Interrupt Delay = 0x0 > Coalesce Interrupt Count = 0x1 > Max outstanding commands = 0x256 > Bus Types = 0x200000 > Server Name = > Heartbeat Counter = 0xffc > > > Trying to put board into Simple mode > I counter got to 1 0 > Controller Configuration information > ------------------------------------ > Signature = CISS > Spec Number = 1 > Transport methods supported = 0x6 > Transport methods active = 0x3 > Requested transport Method = 0x0 > Coalesce Interrupt Delay = 0x0 > Coalesce Interrupt Count = 0x1 > Max outstanding commands = 0x256 > Bus Types = 0x200000 > Server Name = > Heartbeat Counter = 0xffc > > cciss0: <0x3238> at PCI 0000:42:08.0 IRQ 87 using DAC > cciss: intr_pending 8 > cciss: removeQ: Qptr=ffff88027e7500b8, c=ffff88007f83e000, next=ffff88007f83e000, prev=ffff88007f83e000 > Sending 7f83e000 - down to controller > cciss: intr_pending 8 > cciss: Read 4 back from board > cciss: removeQ: Qptr=ffff88027e7500c0, c=ffff88007f840000, next=0000000000000000, prev=0000000000000000 > BUG: unable to handle kernel NULL pointer dereference at 0000000000000248 > IP: [<ffffffffa002502b>] do_cciss_intr+0x6c8/0xb10 [cciss] > PGD 0 > Oops: 0002 [#1] SMP > last sysfs file: /sys/block/ram15/dev > CPU 2 > Modules linked in: cciss(+) ehci_hcd ohci_hcd uhci_hcd > Pid: 0, comm: swapper Not tainted 2.6.28-rc5 #1 > RIP: 0010:[<ffffffffa002502b>] [<ffffffffa002502b>] do_cciss_intr+0x6c8/0xb10 [cciss] > RSP: 0018:ffff88017fa9fee8 EFLAGS: 00010087 > RAX: 0000000000000000 RBX: ffff88007f840000 RCX: 000000000000a3d9 > RDX: 0000000000000000 RSI: 0000000000000046 RDI: ffffffff8080e634 > RBP: ffff88017fa9ff18 R08: 0000000000000000 R09: ffff88017e918800 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff88027e740000 > R13: 0000000000000000 R14: 0000000000000057 R15: 0000000000000086 > FS: 00000000008558f0(0000) GS:ffff88017fc01c80(0000) knlGS:0000000000000000 > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b > CR2: 0000000000000248 CR3: 0000000000201000 CR4: 00000000000006e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process swapper (pid: 0, threadinfo ffff88027f660000, task ffff88027f635400) > Stack: > 0000000000000030 ffff88017ea73640 0000000000000000 0000000000000000 > 0000000000000057 0000000000000000 ffff88017fa9ff48 ffffffff8026a8b9 > ffffffff8074ab00 0000000000000057 ffff88017ea73640 ffffffff8074ab58 > Call Trace: > <IRQ> <0> [<ffffffff8026a8b9>] handle_IRQ_event+0x27/0x57 > [<ffffffff8026c424>] handle_edge_irq+0xde/0x11f > [<ffffffff8020e29b>] do_IRQ+0xfc/0x175 > [<ffffffff8020c3e6>] ret_from_intr+0x0/0xa > <EOI> <0> [<ffffffff8023c7d2>] ? ksoftirqd+0x0/0xa6 > [<ffffffff80212575>] ? default_idle+0x2b/0x40 > [<ffffffff80212799>] ? c1e_idle+0xe5/0xec > [<ffffffff8056a7f6>] ? atomic_notifier_call_chain+0xf/0x11 > [<ffffffff8020acd1>] ? cpu_idle+0x40/0x5e > [<ffffffff8056284e>] ? start_secondary+0x174/0x179 > Code: 8b 83 48 02 00 00 48 39 d8 74 37 49 39 9c 24 c0 00 01 00 75 08 49 89 84 24 c0 00 01 00 48 8b 83 40 02 00 00 48 8b 93 48 02 00 00 <48> 89 90 48 02 00 00 48 8b 93 48 02 00 00 48 89 82 40 02 00 00 > RIP [<ffffffffa002502b>] do_cciss_intr+0x6c8/0xb10 [cciss] > RSP <ffff88017fa9fee8> > CR2: 0000000000000248 > Kernel panic - not syncing: Fatal exception in interrupt > > > Any ideas/suggestions? -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
